Solve for J_2
J_{2}=\frac{u}{10}
Solve for u
u=10J_{2}
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10J_{2}=u
Swap sides so that all variable terms are on the left hand side.
\frac{10J_{2}}{10}=\frac{u}{10}
Divide both sides by 10.
J_{2}=\frac{u}{10}
Dividing by 10 undoes the multiplication by 10.
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